TextView未出現在畫布上

Question

我想在相對佈局上動態添加textView，並且我想在畫布上顯示它。我已經嘗試了下面的代碼。請幫我找出有什麼問題！提前致謝。

公共類MainActivity2擴展活動 {

Paint p= new Paint(); 

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    View myView= new Panel(this); 

    setContentView(myView); 
    p.setColor(Color.BLUE); 

} 


class Panel extends View 
{ 
    RelativeLayout rl= new RelativeLayout(getApplicationContext()); 
    TextView tv = new TextView(getApplicationContext()); 

    public Panel(Context context) { 
     super(context); 


     tv.setText("Helllllloo"); 
     rl.addView(tv); 

    } 


    @Override 
    public void onDraw(Canvas canvas) 
    { 
     rl.draw(canvas); 
     canvas.drawText("helllo canvas!1!!!!!!!", 0, 100, p); 

    } 



} 

}

Answer 1

我解決它通過增加相對佈局和設置內容查看獨立意見作爲使相對佈局！